linux-kernel - Re: [PATCH net-next v8 2/2] net: stmmac: Add support for Allwinner A523 GMAC200

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Message-ID: <CAGb2v66AKNyV0YegdnZPOV+bh6dNU9ecmtKRqw4HnBO+ZCrBDA@mail.gmail.com>
Date: Wed, 1 Oct 2025 10:44:08 +0800
From: Chen-Yu Tsai <wens@...nel.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Heiner Kallweit <hkallweit1@...il.com>, Russell King <linux@...linux.org.uk>, 
	Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Jernej Skrabec <jernej@...nel.org>, Samuel Holland <samuel@...lland.org>, netdev@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	Andre Przywara <andre.przywara@....com>, Jernej Skrabec <jernej.skrabec@...il.com>
Subject: Re: [PATCH net-next v8 2/2] net: stmmac: Add support for Allwinner
 A523 GMAC200

On Wed, Oct 1, 2025 at 8:20 AM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Mon, 29 Sep 2025 18:08:04 -0700 Jakub Kicinski wrote:
> > On Fri, 26 Sep 2025 03:15:59 +0800 Chen-Yu Tsai wrote:
> > > The Allwinner A523 SoC family has a second Ethernet controller, called
> > > the GMAC200 in the BSP and T527 datasheet, and referred to as GMAC1 for
> > > numbering. This controller, according to BSP sources, is fully
> > > compatible with a slightly newer version of the Synopsys DWMAC core.
> > > The glue layer around the controller is the same as found around older
> > > DWMAC cores on Allwinner SoCs. The only slight difference is that since
> > > this is the second controller on the SoC, the register for the clock
> > > delay controls is at a different offset. Last, the integration includes
> > > a dedicated clock gate for the memory bus and the whole thing is put in
> > > a separately controllable power domain.
> >
> > Hi Andrew, does this look good ?
> >
> > thread: https://lore.kernel.org/20250925191600.3306595-3-wens@kernel.org
>
> Adding Heiner and Russell, in case Andrew is AFK.
>
> We need an ack from PHY maintainers, the patch seems to be setting
> delays regardless of the exact RMII mode. I don't know these things..

AFAIK the delays only apply to the RGMII signal path, i.e. they are no-op
for RMII. Also, the delays are unrelated to the 2ns delay required by RGMII.
These delays are more for tweaking minute signal length differences.

ChenYu